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Published on: April 17, 2017
Un elemento estructural de ARN sensible al ultravioleta en un dominio parecido a un viroide del virus de la hepatitis
A D Branch1, B J Benenfeld, B M Baroudy
1Laboratory of Genetics, Rockefeller University, New York, NY 10021.
Resumen
El ARN del virus delta de la hepatitis (VHD) tiene un nuevo elemento estructural sensible a los rayos UV en su región no codificante conservada. Este descubrimiento confirma un modelo de ARN tipo varilla y sugiere propiedades parecidas a los viroides.
Área de la Ciencia:
- Virología Virología.
- Biología Molecular Biología Molecular
- La estructura del ARN es la estructura del ARN.
Sus antecedentes:
- Se propone que el genoma del virus de la hepatitis delta (VHD) tenga dominios funcionales distintos.
- Se sospecha que una región no codificante conservada dentro del genoma de HDV alberga características estructurales críticas.
Objetivo del estudio:
- Investigar un nuevo elemento estructural dentro del dominio conservado del genoma del ARN del VHD.
- Explorar la relación entre este elemento y las estructuras viroides de las plantas.
- Para confirmar el modelo de varilla propuesto de la estructura del ARN del HDV.
Principales métodos:
- Análisis del enlace cruzado inducido por rayos UV en las transcripciones de ARN HDV.
- Mapeo de elementos estructurales dentro de regiones genómicas conservadas.
- Comparación con las estructuras conocidas de ARN viroide de plantas.
Principales resultados:
- Se identificó un nuevo elemento estructural terciario sensible a los rayos UV en el dominio conservado del ARN del VHD.
- El cruce de enlaces UV confirmó un enlace covalente entre segmentos de ARN no contiguos, que soporta una estructura no ramificada y parecida a una varilla.
- Esta región conservada, que contiene la nueva estructura y los sitios de auto-escisión, se asemeja a los dominios de ARN viroide.
Conclusiones:
- El genoma del VHD contiene un dominio parecido a un viroide caracterizado por una estructura conservada y capacidad de respuesta a los rayos UV.
- Este hallazgo apoya un modelo de ARN HDV con regiones funcionales distintas.
- Los paralelos estructurales plantean preguntas sobre los orígenes evolutivos y las interacciones de las moléculas de ARN.
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